Air cleaner and coupling



Dec. 30, 1930. F. A. DBNALDSON AIR CLEANER AND coUPLING Filed Aug. l, '1929 Patented Dec. 30, 1930 'STATES FRANK A. noNALDsoN, o F MINNEAroLIs, MINNESOTA AIB. CLEANER AND coUPLiNG Application aiea Aagust .1, 1929. seran No. 332,686.

My present invention .relates to air cleaners for 'internal combustion engines and, as a major feature, invplves extremely lsimple and highly efficient '.meansfer (letachably coupling the air .cleaner to the i'ntake'port or passage of the carburetor. Generally stated, the invention consists of the novel devices, combinations of devices and arrangement of parts hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like .characters indicate like parts throughout the :several views.

Referring to the drawings:

Fig. 1 is a view'chieiy in .side elevation but with some parts removed andsome parts in section, showing the improved `air cleaner applied to the intake port .of y.the carburetor of an internal combustion engine;

Fig. 2 is a .ront'elevationof the parts .shown in Fig. 1; Y

' Fig. 3 is a section taken 4o n the line 3-3 of Fig. 2; and

Fig. 4 is an inner end elevation of the air cleaner removed from Working position,

some parts being broken away.

The particular carburetor illustrated is 'of a type commercially usedinconnection with a small two-cycle internal .combustion engine applied for operating washing machines, but it is evident that the carburetor might be used in various other applications.

It is important, however, that the carburetor be of a type provided With an exposed annularenlargement or seat of ya nature presently 'to be described.

Referring brieiy to the parts of the carburetor illustrated, the numeral 5 indicates the bodythereof, which is bolted or otherwise secured to the engine crank case 6 and communicatesfwith the intake passage thereof. The numeral 7' indicates lthe stem of the throttley valve and" the numeral 8 the depending gasoline-intake tube, which latter draws gasoline from al reservoir, Vnot shown in the drawings, but which, in practice, is suitably secured to the carburetor body 5. In this particular carburetor, the air intake port 9 is at the upper portion thereof land -this port 9, .at its outer portion, is formed been indicated that the .carburetor may take various different forms, but it is important that the intake `port thereof be provided with the seat 10 orthe equivalent thereof.

An air cleaner for the above purpose and particularly one for .use in connection with the .small carburetorsuch as used with small internal combustion engines, should not only be smallbut of egtremelysimple construction and yet of high efficiency, and it should be capable of very lquick and easy application .to vthe'carburetor and removal therefrom. In ac cordance with these requirements, the bo y of the carburetor is preferably formed with a cylindrical portion 11 and a trlincated conical portion 12, the contracted portion ot' which terminates in a neck 13 having an external channel. The outer -iange of the channeled neck 13 is of such diameter that .it will pass very freely through the contracted outer portion of the seat 10.' Seated in the channeled neck 13 a springJnetal coupling ring 14 preferablyi'ormed from round spring steel Wire that is split at one-portion at 14. This coupling ring 14`is ofsuch normal diameter that it fits with clearance around the bottom of the channel of the neck `153 and has an external diameter somewhat greater than the internal diameter of the seat 10 and, normally, said ring 14 projects dialnetricalliy out of said channel or diamctrically beyond theoutside flange of the channel so that it is always exposed for rictional contact with -the seat 10 and is adapted to be contracted when inserted into saidseat. With this Varrangement, to couple the air cleaner to the by giving the same a slight rocking movement rather than a direct axial outward pull, to. detach the air cleaner from the carburetor.

The air cleaner is completed by the application of two concavo-convex perforated .disc-like heads 15 and 16, the former of which The two heads 1 5 and 16 are preferably set with their convex faces in the same direction,

' so that the two discs are substantially parallel. y

What I claimis;

1.` An air cleaner having'a contracted neck portion formed with an external channel and in said channel an expansible and contract# ible split spring coupling ring adapted for I engagement with a seat into said channel neck is insertable.

2. An air -cleaner having a cylindrical body portion. containing a filtering material and provided at its delivery .end with a truncated conical contracted portion terminating in a neck affording an air delivery port and having an external channel, and an cxpansible and contractible split coupling ring seated in said channel with clearance from the bottomthereof sothat'it. may be contracted, the outer portion of said. ring normally projecting out of saidchannel so that it will engage a seat into which said channeled neck is inserted. 'l

-3. For use with a carburetor having an intake port formed with anA annular coupling seat of less diameter at its outermost than at its innermost portion, an air cleaner having a neck affording an air delivery passage and formed withanexternal channel, said-- neck being adapted for free insertion into said coupling seat; and split spring coupling ring seated in the channel of said neck, said ring Vnormallyhaving vclearance from the bottom of said channel and having a normal ,external diametery greater than that of.

the outsidev flange of said channel and .greater than the diameter of the outer edge portion of said coupling seat.-

4.. The structure defined in claim 1 in which said contracted neck portion is made short by termination thereof substantially at the outer wall of said channel so that said ring may be'engaged with and 'disengaged from its seat by a slight rocking movement.

5. The structure defined in claim 2 in which said contracted neck portion is made short by termination thereof substantially' at the outer wall of said channel so that said ring may be engaged with and disengaged from its seat by a Slight rocking movement.

In testimony whereof I affix my signature.

FRANK A. DONALDSON.

CERTIFICATE OF CORRECTION.

Patent No. 1,787,235. Y Granted December 30, 1930, to

` FRANK A. DONALDSON.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 34, claim l, after the word "into" insert the word which; andl that the saidLetters' Patent should be read with this correction therein that the same may conform to l the recordof the case in the Patent Office.

Signed and sealed this 27th day oflanuary, A. D. 1931.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

